Nikon D6 User Manual With Warranty page 79

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If two memory cards are inserted, the camera will show the
number of additional photographs that can be recorded to
the card in Slot 1. When the card in Slot 1 is full, the display will
show the number of exposures remaining on the card in Slot
2.
•
Values over 1000 are rounded down to the nearest hundred.
For example, values in the vicinity of 1400 are shown as 1.4 k.
•
If the memory card is full or a card error has occurred, the icon
for the affected slot will flash.
The Battery Level and Number of Exposures Remaining
49